/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.wsinfra.wsr.impl;

import java.util.Hashtable;

import cgl.narada.wsinfra.WsMessageFlow;
import cgl.narada.wsinfra.exception.DeploymentException;
import cgl.narada.wsinfra.wsr.WsrSinkGroupMonitor;
import cgl.narada.wsinfra.wsr.WsrSinkGroupMonitorFactory;
import cgl.narada.wsinfra.wsr.storage.WsrStorageException;

/** 
    This is a factory class which ensures that there is only instance of the
    GroupMonitorThread running for a given database. If there are multiple
    databases with multiple sources/sinks this factory class will still work
    fine.

    @author Sima Patel
    $Date: 2005/03/04 16:52:52 $
    $Revision: 1.1 $
*/


public class WsrSinkGroupMonitorFactoryImpl implements WsrSinkGroupMonitorFactory {
    private static final WsrSinkGroupMonitorFactory instance = 
                                              new WsrSinkGroupMonitorFactoryImpl();
  
    private Hashtable monitors;
    private String moduleName = "WsrSinkGroupMonitorFactory: ";
  
    private WsrSinkGroupMonitorFactoryImpl() {
        monitors = new Hashtable();
    }
  
    public static WsrSinkGroupMonitorFactory getInstance() {
        return instance;
    }
  
    /** Gets a Sink Group monitor for the specified configuration file. For a 
    given configuration file (based on the absolute path name) only one
    instance of the WsrSinkGroupMonitor will be running within a given
    JVM instance. */
    public WsrSinkGroupMonitor getWsrSinkGroupMonitor(
                                 String configInfo, WsMessageFlow wsMessageFlow) 
                           throws WsrStorageException, DeploymentException {
        String errorReport = null;
        if (configInfo == null) {
            errorReport = moduleName + "Specified configFile is NULL!";
            throw new DeploymentException(errorReport);
        }
        if (wsMessageFlow == null) {
            errorReport = moduleName + "Specified WsMessageFlow is NULL!";
            throw new DeploymentException(errorReport);
        }
        
        WsrSinkGroupMonitor wsrSinkGroupMonitor;
        
        if (!monitors.containsKey(configInfo)) {
	    System.out.println("I am creating new Sinkgroupmonitor for file: "+ configInfo);
            wsrSinkGroupMonitor = new WsrSinkGroupMonitorImpl(configInfo, 
                                                            wsMessageFlow);
            monitors.put(configInfo, wsrSinkGroupMonitor); 
        }
        wsrSinkGroupMonitor = (WsrSinkGroupMonitor) monitors.get(configInfo);
        return wsrSinkGroupMonitor;
    }
     

}
